Contoh program batas bilangan C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace finalyuty
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] nama = new string[20];
            string[] nim = new string[20];

            int i, n = 0;
            Console.Write("Masukan Batas :");
            n = int.Parse(Console.ReadLine());
            for (i = 1; i <= n; i++)
            {
                Console.WriteLine("Data ke :" + i);
                Console.Write("Nama :");
                nama[i] = Console.ReadLine();
                Console.Write("NPM :");
                nim[i] = Console.ReadLine();
                Console.WriteLine();
            }
            Console.Clear();
            for (i = 1; i <= n; i++)
            {
                Console.WriteLine("Data ke:" + i);
                Console.WriteLine("Nama :" + nama[i]);
                Console.WriteLine("NPM :" + nim[i]);
            }
        }
    }
}

using System;
using System.Collections.Generic;

namespace BatasBilangan
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Masukkan bilangan: ");
            int bilangan = Convert.ToInt32(Console.ReadLine());

            BatasiBilangan(bilangan);
        }

        static void BatasiBilangan(int bilangan)
        {
            if (bilangan < 0)
            {
                Console.WriteLine("Bilangan terlalu kecil!");
            }
            else if (bilangan > 100)
            {
                Console.WriteLine("Bilangan terlalu besar!");
            }
            else
            {
                Console.WriteLine("Bilangan valid.");
            }
        }
    }
}